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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6948c53d871b456c42e37b4656bf5181f7bafdc793b540818ea044aed512d4' 
  AND token = 'trr8n0IyiaholPPoPHzQWDO0N1sJTt5xpAct4MgUUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}